TY JOUR TI IMPROVING THE PERFORMANCE OF THE VORTEX COLUMN CONCENTRATION OF SULFURIC ACID KW SPENT SULFURIC ACID KW VORTEX COLUMN KW VORTEX CONTACT STAGE KW HYDRAULIC RESISTANCE KW RELATIVE SPRAY LOSS KW HOLDING CAPACITY IN THE LIQUID PHASE JO Herald of Technological University AU , .. AU Sabirov, I.M. AU Fazullin, R.H. AU , .. PY 2026 IS 29 PB Kazan National Research Technological University